type TGlyphFormat int
const (
  GLYPH_FMT_ALPHA TGlyphFormat = C.GLYPH_FMT_ALPHA
  GLYPH_FMT_MONO TGlyphFormat = C.GLYPH_FMT_MONO
  GLYPH_FMT_RGBA TGlyphFormat = C.GLYPH_FMT_RGBA
  GLYPH_FMT_ALPHA2 TGlyphFormat = C.GLYPH_FMT_ALPHA2
  GLYPH_FMT_ALPHA4 TGlyphFormat = C.GLYPH_FMT_ALPHA4
)
